Curve expression in IFC
I know that the entity representing the curve is IfcTrimmedCurve, and I found that it will reference the information of IfcCircle. So my guess is: in IFC (especially the 2X3 version), can only "arc lines" be used to represent curves?
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https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcbsplinecurve.htm
Also specifically for infrastructure there are alignment curves.